Honeywell 20 V-A general purpose transformers power 24 VAC circuits. Although typically used in heating/cooling control systems, they can be used in any application that doesn't exceed the load ratings.

Honeywell Transformer, 20 V-A, 120 VAC Primary, 27 V Secondary, 60 Hz, Foot Mounting, 9 in Lead Wires Secondary Connection, -20 to 105 deg F, 3-3/16 in W x 1-11/16 in H x 1-3/4 in D, Import

• Color-coded lead wires for primary connections and screw terminals for secondary connections
• Identified class 2 not wet, class 3 wet
• 24 VAC at 20 V-A electrical rating
• Metal end bells
• With 9 in lead wires

• Instruction/Installation Manual https://assets.unilogcorp.com/267/ITEM/DOC/Honeywell_AT120B1028_U_Instruction_Installation_Manual.pdf